US7913785B2 - Snowmobile cooling system - Google Patents
Snowmobile cooling system Download PDFInfo
- Publication number
- US7913785B2 US7913785B2 US12/059,489 US5948908A US7913785B2 US 7913785 B2 US7913785 B2 US 7913785B2 US 5948908 A US5948908 A US 5948908A US 7913785 B2 US7913785 B2 US 7913785B2
- Authority
- US
- United States
- Prior art keywords
- snowmobile
- tunnel
- radiator
- track
- frame
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related, expires
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/18—Arrangements or mounting of liquid-to-air heat-exchangers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
- F01P11/10—Guiding or ducting cooling-air, to, or from, liquid-to-air heat exchangers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
- F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
- F28D1/0246—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid heat-exchange elements having several adjacent conduits forming a whole, e.g. blocks
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
- F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
- F28F3/04—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element
- F28F3/048—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of ribs integral with the element or local variations in thickness of the element, e.g. grooves, microchannels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
- F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
- F28D2001/0253—Particular components
- F28D2001/026—Cores
- F28D2001/0273—Cores having special shape, e.g. curved, annular
Definitions
- the present invention relates to a snowmobile cooling system.
- snowmobiles have a frame made of bent sheet metal and metal tubing.
- a forward portion of the frame forms an engine cradle for supporting an internal combustion engine.
- a rearward portion of the frame forms a tunnel generally having an inverted U-shape.
- a drive track is disposed at least in part in the tunnel and is driven by the engine to propel the snowmobile.
- the combustion of fuel in the engine produces a significant amount of heat, and some of this heat is absorbed from the engine by a coolant, such as a mixture of water and ethylene glycol, to maintain the engine at a suitable temperature.
- the hot coolant is then pumped to a radiator, where the heat is dissipated to the atmosphere.
- the rotation of the track 10 inside the tunnel 14 causes cold air and snow to circulate in the tunnel 14 .
- the number of radiators and their size and positions within the tunnel 14 are dictated by the cooling requirements of the engine.
- the radiator 16 is positioned on the front wall 18 of the tunnel 14 , the radiator 20 is positioned on the top surface 22 of the tunnel 14 , and the radiator 24 is positioned on the inside of a rear portion 26 of the tunnel 14 in combination with a snow flap 28 to increase the quantity of snow that comes into contact with the radiator 24 .
- the radiator 30 may be constructed as part of the top surface 32 of the tunnel 34 , resulting in a reduced-weight snowmobile.
- the metal frame When the radiator is positioned on the front wall of the tunnel, the metal frame conducts heat from the radiator to the engine compartment situated forwardly of the tunnel. As a result, the temperature of the engine compartment is increased, thereby reducing the effectiveness of the radiator to cool the engine.
- the radiator Regardless of where the radiator is positioned on the tunnel, heat from the radiator is transferred to the tunnel. Snow coming into contact with the warm tunnel melts and later re-freezes, resulting in ice build-up on one or more of the tunnel, the track and the rear suspension assembly. The ice build-up increases the weight of the snowmobile. In addition, water that re-freezes on the track and rear suspension assembly when the snowmobile is not in use can in some cases result in the suspension or the track becoming jammed, making the snowmobile difficult to move.
- the invention provides a snowmobile comprising a frame.
- a tunnel is formed in a rearward portion of the frame.
- An engine is disposed on the frame.
- a drive track is disposed at least in part in the tunnel.
- the drive track is operatively connected to the engine for propulsion of the snowmobile.
- At least one ski is operatively connected to the frame at least in part forwardly of the drive track.
- a straddle seat is disposed on the frame at least in part above the drive track.
- a steering device is operatively connected to the at least one ski for steering the snowmobile.
- a radiator is disposed between the tunnel and the track.
- the radiator has a first side facing the track and a second side facing the tunnel.
- the second side is generally opposite the first side. At least a portion of the second side is spaced apart from the tunnel.
- At least 25% of the second side is spaced apart from the tunnel.
- At least 50% of the second side is spaced apart from the tunnel.
- At least 75% of the second side is spaced apart from the tunnel.
- the entire second side is spaced apart from the tunnel.
- an air passage is between the second side of the radiator and the tunnel.
- the direction of air flow along the first side is opposite the direction of air flow along the second side.
- the radiator is disposed at least in part forwardly of the track.
- the tunnel has a front wall.
- the second side of the radiator faces the front wall of the tunnel.
- the second side of the radiator generally follows a contour of the front wall of the tunnel.
- the top wall of the tunnel has a downwardly-extending projection disposed generally rearwardly of the air passage.
- the direction of air flow along the first side is opposite the direction of air flow along the second side.
- the first side of the radiator is generally arcuate.
- the track is supported by a plurality of axles.
- One of the plurality of axles is a forwardmost axle.
- the first side of the radiator forms a generally circular arc having a center of curvature approximately at an axis of rotation of the forwardmost axle.
- the radiator has an inlet and an outlet.
- the inlet and the outlet communicate with an interior of the radiator via the second side.
- the inlet and the outlet pass through the front wall of the tunnel.
- the first side of the radiator has a plurality of fins projecting outwardly therefrom in the direction of the track.
- the second side of the radiator has generally flat sections.
- the first side of the radiator has a first plurality of fins projecting outwardly therefrom in the direction of the track.
- the second side of the radiator has a second plurality of fins projecting outwardly therefrom.
- the second plurality of fins contact the tunnel.
- Embodiments of the present invention each have at least one of the above-mentioned objects and/or aspects, but do not necessarily have all of them. It should be understood that some aspects of the present invention that have resulted from attempting to attain the above-mentioned objects may not satisfy these objects and/or may satisfy other objects not specifically recited herein.
- FIG. 1 is a schematic cross-sectional view of a prior art snowmobile tunnel, taken along the longitudinal centerline of the tunnel;
- FIG. 2 is a perspective view, taken from a rear, left side, of a prior art frame assembly for a snowmobile;
- FIG. 3 is a perspective view, taken from a front, right side, of a snowmobile in accordance with aspects of the present invention
- FIG. 4 is a cross-sectional view of a front portion of the tunnel and radiator of the snowmobile of FIG. 3 , taken along the longitudinal centerline of the snowmobile of FIG. 3 ;
- FIG. 5 is a partial cut-away perspective view of the tunnel and radiator of FIG. 4 ;
- FIG. 6 is a cross-sectional view of a front portion of the tunnel and radiator of a snowmobile according to an alternative embodiment
- FIGS. 7A-7C are schematic cross-sectional views of snowmobile tunnels, taken along the longitudinal centerline of the tunnel, showing various embodiments of radiator arrangements.
- FIGS. 8A-8D illustrate various alternative embodiments of the radiator of the snowmobile of FIG. 3 .
- the snowmobile 100 has a forward end 102 and a rearward end 104 which are defined consistently with a travel direction of the vehicle.
- the snowmobile 100 has a frame 105 including a tunnel 106 and an engine cradle 108 .
- the tunnel 106 generally consists of one or more pieces of sheet metal bent to form an inverted U-shape.
- the tunnel 106 extends rearwardly along the longitudinal centerline of the snowmobile 100 and is connected at the front to the engine cradle 108 .
- An engine 110 (schematically illustrated) is supported by the engine cradle 108 .
- a number of fairings 112 are supported on the frame 105 to provide aesthetic appeal and to shield some components of the snowmobile 100 from the elements.
- a straddle seat 114 is provided above the tunnel 106 for accommodating a rider and, optionally, one or more passengers. Footrests 115 extend outwardly from the tunnel 106 to support the feet of the rider and passengers.
- a pair of skis 116 at the front end 102 of the snowmobile 100 are connected to the frame via a suspension system 118 .
- a steering assembly 120 is provided generally forwardly of the seat 114 , and is connected to the skis 116 in a known manner such that turning the steering assembly 120 turns the skis 116 to steer the snowmobile 100 . It should be understood that the snowmobile 100 may alternatively have only a single ski 116 .
- an endless track 122 is supported by a rear suspension system 124 .
- the rear suspension system 124 includes a pair of slide rails 126 in sliding contact with the track 122 .
- the upper portion of the track 122 is disposed in the tunnel 106 .
- the track 122 is driven by the engine 110 via a transmission (not shown) to propel the snowmobile 100 .
- a cooling system circulates a liquid coolant through the engine 110 to absorb some of the heat generated by the combustion of fuel in the engine 110 and maintains the engine 110 at a suitable operating temperature.
- the coolant is then circulated to a radiator 128 ( FIG. 4 ) that will be described below in further detail, to dissipate the heat to the atmosphere.
- a first side 132 of the radiator 128 faces a forward portion of the track 122 .
- the first side 132 is generally arcuate and forms a generally circular arc with its center of curvature approximately at the axis of rotation 133 of the forwardmost axle 135 supporting the track 122 , such that the first side 132 and the track 122 form an air passage 137 of approximately uniform width therebetween.
- a plurality of fins 139 extend outwardly from the first side 132 , generally in the direction of the track 122 , to provide increased thermal contact between the radiator 128 and the air passage 137 .
- a second side 134 of the radiator 128 faces the front wall 130 of the tunnel 106 and is spaced apart therefrom.
- the second side 134 generally follows the contour of the front wall 130 .
- An air passage 138 is formed in the space between the radiator 128 and the front wall 130 of the tunnel 106 .
- the air passage 138 reduces heat transfer from the radiator 128 to the tunnel 106 and thus reduces or eliminates the likelihood of ice build-up on the frame 105 .
- the flow of air 154 through the passage 138 contributes to cooling the second side 134 of the radiator 128 as will be discussed below in further detail. Other positions are contemplated for the radiator 128 , as will be described in further detail below.
- the fins 145 may extend far enough away from the second side 134 that they contact the front wall 130 , in which case the spacers 143 may be omitted. It is further contemplated that the second side 134 may alternatively be formed of flat sections only, without the fins 145 .
- a downwardly-extending projection is formed in the top wall 136 of the tunnel 106 , generally rearwardly of both the radiator 128 and the air passage 138 .
- the projection 140 prevents snow or other debris from being thrown by the track 122 into the air passage 138 and obstructing the air flow therethrough.
- the projection 140 additionally creates an upward flow of air 154 ( FIG. 4 ) through the air passage 138 , as will be described below in further detail.
- An inlet 142 and an outlet 144 of the radiator 128 pass through apertures in the front wall 130 of the tunnel 106 and allow the cooling system of the engine 110 to communicate with the interior 146 of the radiator 128 via the second side 134 of the radiator 128 .
- Hot coolant from the engine 110 enters the interior 146 of the radiator 128 via the inlet 142 and returns to the engine 110 via the outlet 144 after it has been at least partially cooled by the radiator 128 .
- the engine 110 drives the track 122 to rotate in the direction 146 .
- the rotation of the track 122 causes the circulation 148 of cold air and snow within the tunnel 106 , which in turn induces the circulation 149 of cold air along the first side 132 of the radiator 128 , in the direction of rotation 146 of the track 122 .
- the cold air and snow contact the first side 132 of the radiator 128 , in particular the fins 139 , and absorb heat from the radiator 128 , thereby cooling the coolant circulating therein.
- the projection 140 induces a turbulent air flow 150 in the area of the rearward opening 152 of the air passage 138 .
- the air flow 150 creates an area of reduced pressure at the opening 152 .
- the reduced pressure causes cold air 154 to be drawn through the air passage 138 , along the second side 134 of the radiator 128 in the direction shown.
- the cold air 154 contacts the second side 134 of the radiator 128 , and absorbs heat from the radiator 128 , further cooling the coolant circulating therein.
- the circulation of cold air 154 is in the direction opposite that of the circulation 149 .
- Both the first side 132 and the second side 134 of the radiator 128 are used for dissipating the heat from the engine 110 to the atmosphere.
- the radiator 128 can provide adequate cooling for the engine 110 , in some cases without the need for a second radiator, resulting in a lightweight vehicle with a compact cooling system.
- the absence of a second radiator along the top wall 136 of the tunnel 106 additionally reduces the likelihood of ice build-up on components disposed beneath the rear portion of the tunnel 106 , such as the track 122 and the rear suspension system 124 .
- FIG. 6 the operation of an alternative embodiment of a radiator 228 will be described according to a second embodiment.
- the embodiment of FIG. 6 has features similar to those shown in FIG. 4 , they have been given similar reference numbers differing only in the first digit. Some features common to both embodiments are not indicated in FIG. 6 and will not be described again in detail.
- the rotation of the track 222 causes the circulation of cold air 248 and snow within the tunnel 206 , which induces a circulation 249 of cold air and snow along the first side 232 of the radiator 228 , in the direction of rotation 246 of the track 222 .
- the cold air and snow contact the first side 232 of the radiator 228 , in particular the fins 239 , and absorb heat from the radiator 228 , thereby cooling the coolant circulating therein.
- the top wall 236 of the tunnel 206 does not have a feature corresponding to the projection 140 of the embodiment of FIG. 4 .
- a portion 250 of the cold air 248 is directed toward the opening 252 and drives cold air 254 through the air passage 238 , along the second side 234 of the radiator 228 .
- the cold air 254 contacts the second side 234 of the radiator 228 , and absorbs heat from the radiator 228 , further cooling the coolant circulating therein. As can be seen, the circulation of cold air 254 is in the same direction as that of the cold air 248 .
- the radiator 128 A is installed in the position shown in FIG. 4 , at a forward portion of the tunnel 106 , generally forwardly of the track 122 .
- the radiator 128 A is spaced apart from the front wall 130 , and an air passage 138 A is formed therebetween.
- the radiator 128 B is installed along the top wall 136 of the tunnel 106 , generally above the track 122 .
- the radiator 128 B is spaced apart from the top wall 136 , and an air passage 138 B is formed therebetween.
- the radiator 128 C is installed at a rearward portion of the tunnel 106 , generally rearwardly of the track 122 .
- the radiator 128 C is spaced apart from the top wall 136 and the rear wall 156 of the tunnel 106 , and an air passage 138 C is formed therebetween.
- a snow flap 158 may be provided rearwardly of the track 122 to increase the circulation of cold air and snow in the vicinity of the radiator 128 C.
- FIGS. 8A-8D a number of alternative shapes are contemplated for the second side 134 of the radiator 128 .
- a lower portion 135 A of the second side 134 A of the radiator 128 A is in contact with the front wall 130 and an upper portion 136 A of the second side 134 A is spaced apart from the front wall 130 . It is contemplated that the lower portion 135 A may comprise 25%, 50% or 75% of the area of the second side 134 A, with the upper portion 136 A comprising the remainder. It should be understood that the transfer of heat to the tunnel 106 will be reduced to a greater extent if the area of the upper portion 136 A is larger relative to the area of the lower portion 135 A.
- the second side 134 B of the radiator 128 B is spaced apart from the front wall 130 .
- the fins 145 B extend outwardly from the second side 134 B and contact the front wall 130 .
- the fins 145 B are oriented transversely. In this embodiment, the fins 145 B act as spacers between the second side 134 B and the front wall 130 , and a separate spacer 143 is not needed.
- the second side 134 C of the radiator 128 C has two lateral portions.
- One lateral portion 135 C is in contact with the front wall 130 and the other lateral portion 136 C is spaced apart from the front wall 130 .
- the second side 134 C may have more than two lateral portions, for example left and right lateral portions 135 C in contact with the front wall 130 and a central lateral portion 136 C spaced apart from the front wall 130 .
- the lateral portion 135 C may comprise 25%, 50% or 75% of the area of the second side 134 C, with the lateral portion 136 C comprising the remainder. It should be understood that the transfer of heat to the tunnel 106 will be reduced to a greater extent if the area of the upper portion 136 C is larger relative to the area of the lower portion 135 C.
Abstract
Description
Claims (18)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US12/059,489 US7913785B2 (en) | 2008-03-31 | 2008-03-31 | Snowmobile cooling system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US12/059,489 US7913785B2 (en) | 2008-03-31 | 2008-03-31 | Snowmobile cooling system |
Publications (2)
Publication Number | Publication Date |
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US20090241862A1 US20090241862A1 (en) | 2009-10-01 |
US7913785B2 true US7913785B2 (en) | 2011-03-29 |
Family
ID=41115221
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US12/059,489 Expired - Fee Related US7913785B2 (en) | 2008-03-31 | 2008-03-31 | Snowmobile cooling system |
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US (1) | US7913785B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9321509B2 (en) | 2013-12-17 | 2016-04-26 | Arctic Cat Inc. | Snowmobile skid frame assembly |
US11524569B2 (en) * | 2013-08-30 | 2022-12-13 | Bombardier Recreational Products Inc. | Snowmobile heat exchanger assembly |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3835948A (en) * | 1972-12-15 | 1974-09-17 | Hvp Inc | Liquid cooling system for use on snowmobiles |
US5992552A (en) * | 1996-01-22 | 1999-11-30 | Yamaha Hatsudoki Kabushiki Kaisha | Vehicle frame |
US6651765B1 (en) * | 2002-05-02 | 2003-11-25 | Steven M. Weinzierl | Snowmobile with a supercharged engine |
US6681724B1 (en) * | 2001-12-20 | 2004-01-27 | Polaris Industries Inc. | Snowmobile cooling system |
US20070193715A1 (en) * | 2004-09-29 | 2007-08-23 | Arctic Cat Inc. | Snowmobile tunnel and rear heat exchanger |
US7353898B1 (en) | 2005-02-24 | 2008-04-08 | Polaris Industries Inc. | Integrated heat exchanger and engine mount for a snowmobile |
US7448462B2 (en) * | 2005-01-21 | 2008-11-11 | Yamaha Hatsudoki Kabushiki Kaisha | Snowmobile exhaust system |
-
2008
- 2008-03-31 US US12/059,489 patent/US7913785B2/en not_active Expired - Fee Related
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3835948A (en) * | 1972-12-15 | 1974-09-17 | Hvp Inc | Liquid cooling system for use on snowmobiles |
US5992552A (en) * | 1996-01-22 | 1999-11-30 | Yamaha Hatsudoki Kabushiki Kaisha | Vehicle frame |
US6681724B1 (en) * | 2001-12-20 | 2004-01-27 | Polaris Industries Inc. | Snowmobile cooling system |
US6651765B1 (en) * | 2002-05-02 | 2003-11-25 | Steven M. Weinzierl | Snowmobile with a supercharged engine |
US20070193715A1 (en) * | 2004-09-29 | 2007-08-23 | Arctic Cat Inc. | Snowmobile tunnel and rear heat exchanger |
US7448462B2 (en) * | 2005-01-21 | 2008-11-11 | Yamaha Hatsudoki Kabushiki Kaisha | Snowmobile exhaust system |
US7353898B1 (en) | 2005-02-24 | 2008-04-08 | Polaris Industries Inc. | Integrated heat exchanger and engine mount for a snowmobile |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11524569B2 (en) * | 2013-08-30 | 2022-12-13 | Bombardier Recreational Products Inc. | Snowmobile heat exchanger assembly |
US20230108749A1 (en) * | 2013-08-30 | 2023-04-06 | Bombardier Recreational Products Inc. | Snowmobile heat exchanger assembly |
US20230113806A1 (en) * | 2013-08-30 | 2023-04-13 | Bombardier Recreational Products Inc. | Snowmobile heat exchanger assembly |
US11850935B2 (en) * | 2013-08-30 | 2023-12-26 | Bombardier Recreational Products Inc. | Snowmobile heat exchanger assembly |
US9321509B2 (en) | 2013-12-17 | 2016-04-26 | Arctic Cat Inc. | Snowmobile skid frame assembly |
US9771130B2 (en) | 2013-12-17 | 2017-09-26 | Arctic Cat Inc. | Snowmobile skid frame assembly |
US11214334B2 (en) | 2013-12-17 | 2022-01-04 | Arctic Cat Inc. | Snowmobile skid frame assembly |
US11891153B2 (en) | 2013-12-17 | 2024-02-06 | Arctic Cat Inc. | Snowmobile skid frame assembly |
Also Published As
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US20090241862A1 (en) | 2009-10-01 |
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